
Effect · every source
How to increase Fertility in CK3
31 sources raise Fertility and 26 lower it in the game files of patch 1.20.0.3.
fertilityThe biggest boosts
+50%FecundTrait
+30%BeautifulTrait- +30%Like Weeds in a GardenLifestyle perk
What raises Fertility (31)
Traits (12)

Fecund+50%
fecund· game/common/traits/00_traits.txt
Beautiful+30%
beauty_good_3· game/common/traits/00_traits.txt
Lustful+25%
lustful· game/common/traits/00_traits.txt



Family Hierarch+20%
family_first· game/common/traits/00_traits.txt
Seductress+20%
seducer· game/common/traits/00_traits.txt
Whole of Body+20%
whole_of_body· game/common/traits/00_traits.txt
Handsome+20%
beauty_good_2· game/common/traits/00_traits.txt
Comely+10%
beauty_good_1· game/common/traits/00_traits.txt
Pure-blooded+10%
pure_blooded· game/common/traits/00_traits.txt
Lifestyle perks (1)
like_weed_in_a_garden_perk· game/common/lifestyle_perks/00_intrigue_2_temptation_tree_perks.txt
Focuses (2)

Family Focus+20%
Not Adventurer government
diplomacy_family_focus· game/common/focuses/00_lifestyle_focuses.txt
Temptation Focus+20%
Not Adventurer government
intrigue_temptation_focus· game/common/focuses/00_lifestyle_focuses.txt
Tenets (7)

Crescite et Multiplicamini+25%
Followers
tenet_be_fruitful_and_multiply· game/common/religion/tenet_types/00_pam_tenets.txt
Crescite et Multiplicamini+25%
Characters holding it as a personal tenet
tenet_be_fruitful_and_multiply· game/common/religion/tenet_types/00_pam_tenets.txt
Followers
tenet_carnal_exaltation· game/common/religion/tenet_types/00_tenet_types.txt
Characters holding it as a personal tenet
tenet_pastoral_isolation· game/common/religion/tenet_types/00_tenet_types.txt
Kūdikis Lemti+10%
Followers
tenet_sacred_childbirth· game/common/religion/tenet_types/00_tenet_types.txt

Followers
tenet_mystical_birthright· game/common/religion/tenet_types/00_tenet_types.txt
Holy sites (8)
Kanchipuram+15%
Kanchipuram · Followers, while the faith holds it
kanchipuram· game/common/religion/faith_types/00_faith_types.txtKanchipuram+10%
Kanchipuram · Holder of the county
kanchipuram· game/common/religion/faith_types/00_faith_types.txtPaderborn+10%
Paderborn · Followers, while the faith holds it
paderborn· game/common/religion/faith_types/00_faith_types.txtMount Halla+10%
Tamna · Followers, while the faith holds it
halla· game/common/religion/faith_types/00_faith_types.txtOb+10%
Ob · Followers, while the faith holds it
ob· game/common/religion/faith_types/00_faith_types.txtPaderborn+5%
Paderborn · Holder of the county
paderborn· game/common/religion/faith_types/00_faith_types.txtMount Halla+5%
Tamna · Holder of the county
halla· game/common/religion/faith_types/00_faith_types.txt
Dynasty legacies (1)
Bounteous Loins+10%
Kin legacy · Members of the dynasty
kin_legacy_1· game/common/dynasty_perks/00_dynasty_perks.txt
What lowers Fertility (26)
Traits (26)

Leper-95%
leper· game/common/traits/00_traits.txt
Brutally Mauled-75%
wounded_3· game/common/traits/00_traits.txt
Pneumonia-50%
pneumonic· game/common/traits/00_traits.txt
Bubonic Plague-50%
bubonic_plague· game/common/traits/00_traits.txt
Inbred-50%
inbred· game/common/traits/00_traits.txt
Impotent-50%
impotent· game/common/traits/00_traits.txt
Sterile-50%
infertile· game/common/traits/00_traits.txt
Hideous-30%
beauty_bad_3· game/common/traits/00_traits.txt
Chaste-25%
chaste· game/common/traits/00_traits.txt
Severely Injured-25%
wounded_2· game/common/traits/00_traits.txt
Smallpox-25%
smallpox· game/common/traits/00_traits.txt
Ill-20%
ill· game/common/traits/00_traits.txt
Great Pox-20%
great_pox· game/common/traits/00_traits.txt
Disfigured-20%
disfigured· game/common/traits/00_traits.txt
Cancer-20%
cancer· game/common/traits/00_traits.txt
Typhus-20%
typhus· game/common/traits/00_traits.txt
Ugly-20%
beauty_bad_2· game/common/traits/00_traits.txt
Scaly-20%
scaly· game/common/traits/00_traits.txt
Melancholic-10%
depressed_1· game/common/traits/00_traits.txt
Melancholic-10%
depressed_genetic· game/common/traits/00_traits.txt
Infirm-10%
infirm· game/common/traits/00_traits.txt




Homely-10%
beauty_bad_1· game/common/traits/00_traits.txt
Source: game/common/dynasty_perks/00_dynasty_perks.txt, game/common/focuses/00_lifestyle_focuses.txt, game/common/lifestyle_perks/00_intrigue_2_temptation_tree_perks.txt, game/common/religion/faith_types/00_faith_types.txt, game/common/religion/tenet_types/00_pam_tenets.txt, game/common/religion/tenet_types/00_tenet_types.txt, game/common/traits/00_traits.txt and the English localisation, Crusader Kings III 1.20.0.3. Building chains are shown once, at their strongest level, with the range over their levels. Effects that come only from events or scale with a script value are not listed.